Comments on: Capacity vs. Performance: De-duplication http://storagesavvy.com/2009/08/17/capacity-vs-performance-de-duplication/ Deciphering the complex topics around enterprise storage systems, technology, and trends in the industry. Fri, 04 May 2012 06:09:47 +0000 hourly 1 http://wordpress.com/ By: storagesavvy http://storagesavvy.com/2009/08/17/capacity-vs-performance-de-duplication/#comment-171 Thu, 21 Oct 2010 17:18:26 +0000 http://storagesavvy.com/?p=13#comment-171 No problem..

If there are multiple LUNs in a single FlexVol, deduplication should work across all of the LUNs in that FlexVol. LUNs are treated the same as files in a NetApp volume (FlexVol). Depending on the use case you may want to have only 1 LUN per FlexVol (or if your data exceeds the maximum size of a FlexVol you would have to). Since deduplication only works on files/LUNs inside a particular FlexVol, the efficiency may fall as you grow.

]]> By: Michael McMorrow http://storagesavvy.com/2009/08/17/capacity-vs-performance-de-duplication/#comment-170 Thu, 21 Oct 2010 17:13:30 +0000 http://storagesavvy.com/?p=13#comment-170 I think we’re using different terminology. I know that deduplication works at the volume (FlexVol) level. LUNs are created within FlexVols. I thought you were referring to an instance in which multiple LUNs are created within a single FlexVol. I guess you were using the term LUN and Volume interchangably. Does that sound right? Thanks for the quick reply, and for the reference to the documentation.

]]> By: storagesavvy http://storagesavvy.com/2009/08/17/capacity-vs-performance-de-duplication/#comment-169 Thu, 21 Oct 2010 16:53:22 +0000 http://storagesavvy.com/?p=13#comment-169 NetApp document TR-3505 describes deduplication in OnTap pretty well. They never really state that “deduplication only works within a single volume” but they imply it with statements like “Deduplication is enabled on a per flexible volume basis” on page 7 and “It operates on the active file system of the flexible volume” on page 4.

]]> By: Michael McMorrow http://storagesavvy.com/2009/08/17/capacity-vs-performance-de-duplication/#comment-168 Thu, 21 Oct 2010 15:59:41 +0000 http://storagesavvy.com/?p=13#comment-168 Hi! This is an excellent blog entry. One question. You say, “…and A-SIS can only de-dupe data within a LUN but not across multiple LUNs.”. I can’t find any documentation that supports this statement. However, based on my own testing, I believe that you are correct. Can you point me to any documentation that supports your statement? Thank you!

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